rename 'label' to 'name'.

Warning : this commit require to rename some table column, but the
original Version file has been update.

If you do not care to loose your date, you may run :

```
php app/console doctrine:migrations:execute --down 20160318111334
php app/console doctrine:migrations:execute --up 20160318111334
php app/console doctrine:cache:metadata #(if you have a cache for
doctrine meta date)
```
close #20

Resources/config/doctrine/Event.orm.yml

@@ -8,7 +8,7 @@ Chill\EventBundle\Entity\Event:
             generator:
                 strategy: AUTO
     fields:
-        label:
+        name:
             type: string
             length: '150'
         date:

Resources/config/doctrine/EventType.orm.yml

@@ -8,7 +8,7 @@ Chill\EventBundle\Entity\EventType:
             generator:
                 strategy: AUTO
     fields:
-        label:
+        name:
             type: json_array
         active:
             type: boolean

Resources/config/doctrine/Role.orm.yml

@@ -8,7 +8,7 @@ Chill\EventBundle\Entity\Role:
             generator:
                 strategy: AUTO
     fields:
-        label:
+        name:
             type: json_array
         active:
             type: boolean

Resources/config/doctrine/Status.orm.yml

@@ -8,7 +8,7 @@ Chill\EventBundle\Entity\Status:
             generator:
                 strategy: AUTO
     fields:
-        label:
+        name:
             type: json_array
         active:
             type: boolean